MMR Performance | Single piece crank hub | BMW N55 & S55

At PERON Automotive, we take engine reliability seriously—especially when it comes to the well-known weaknesses of the OEM three-piece crank hub found in BMW’s S55 and N55 engines. That’s why we trust and supply the MMR Performance one-piece billet crank hub, a critical upgrade for any tuned or track-driven M car.

Crank hub slip can lead to catastrophic timing issues and severe engine damage. The MMR one-piece solution eliminates the failure-prone design of the OE component, offering a solid, precision-engineered upgrade that locks everything in place.

For complete protection, we recommend pairing the crank hub with the optional MMR Capture Plate, which prevents the crank bolt from loosening due to engine vibrations or harmonic resonance—an added layer of security for peace of mind in any high-stress environment.

Why Upgrade?

• Replaces the problematic OE three-piece crank hub

• Precision-machined from billet aluminium for ultimate strength

• Essential for tuned or track-driven S55 and N55 engines

• Optional Capture Plate prevents crank bolt loosening

• Tested and installed by PERON Automotive on customer and demo vehicles

• A must-have for high-performance reliability

Don’t leave your engine’s fate to chance—this is one of the most critical upgrades you can make to protect your investment.